Mammals from Xurlh-east Africa. 303 



There is no evidence of any marked diffcronce of a<^e 

 belweeii the three skulls, but, it anything, the type of typas 

 is the oldest of all. 



In colour the typo o^ fort i or is rather browner tlian tliat of 

 Decjeni, the feet are darker, and the yellowish markings over 

 the eyes and on and behind the ears are practically absent. 



^I'he following are the general measuretnents of the type : — 



Head and boily 182 mm.; tail 97; hind foot 30 ; ear 26. 



Skull: greatest length 39; basilar length 32"2; greatest 

 breadth l'J'8 ; jialatilar length 18';j; palatal foramina 7"7 ; 

 K'ni;th of upper molars (crowns) i:)'5. 



Ilah. Charada, lv;iffa. Alt. 6000'. 



Ti/pc. Adult female. Original number 102. Collectel 

 4tli"june, 1905. 



Tatera I/arringloni, sp. n. 



Allied to T. Enifiiij Tlio^^., but much smaller. 



Size very small for a Tatera. General colour along tlie 

 dorsal area ebiy-colour, darkened by the minute blackisli tips 

 to the hairs. Sides clearer, more nearly " pinkish buflf,^' the 

 hairs with whitish subterminal bands. Lower part of muzzle 

 pure white, the same region in Emini being more or less 

 buffy. A patch above and behind each eye dull whitish. A 

 white patch behind each ear. Hands and feet wdiite as 

 usual. Soles naked jiosteriorly, but with a band of short 

 hairs crossing them near the base of the hallux, as in Emini 

 alone of other gerbilles. Tail unusually well tufted, with 

 long brownish-black hairs, whicli attain a length at the tip 

 of about 14 mm. ; shorter hairs of tail dull buHy whitish. 



Skull closely similar to that of T. Emiuij but conspicuously 

 smaller throughout. 



The posterior j)alatal vacuities, between the molars, are, 

 however, much narrower than the anterior palatal foramina, 

 while in T. Emini they are nearly or quite as broad as the 

 latter. 



Dimensions of the ty[)e (measured in the flesh) : — • 



Head and body 96 mm. ; tail 132 ; hind foot 28; ear 19. 



Skull: greatest length o0'7 ; basilar length '12''6; inter- 

 orbital breadth 6 ; breadth of brain-case 14*2 ; diastema 8*2 ; 

 palatal foramina b'lx 2; length of bulla 9 ; length of upper 

 molar series 4"o. 



Hab. Mutti Galeh, E. of Lake Rudolf. Alt. 2300'. 



Tyjie. Adult female. Original number 122. Collected 

 26th July, 1905. 



" Caught in dry river-beJ." 



This pretty gerbiile is allied only to T. Emini, with which 



